1-1/2" (38 mm) Acme fine adjustment thread – the largest in the industry

Large, convenient adjustment handle

Set screw for double margin of safety

Set screw can lock jack head to stand for transportation – no loose pieces

About the Hi Boy
Sumner now offers a tall jack specifically designed for tight pipe installation, such as in mechanical rooms or tunnels. The Hi Boy is a safe, portable folding stand that is easy to transport and holds a hefty 1,000 pounds (450 Kg) at 72" (183 cm). In its lowest position of 39" (99 cm), the Hi Boy is ideal for normal fabrication of weld pipe. Legs fold up for convenient storage in job boxes or truck beds.